Measurement of Branching Fraction of $\Lambda_c^+ \to p K_S^0 \pi^0$ at Belle}

Abstract We report a precise measurement of the ratio of branching fractions $\mathcal{B}(\Lambda_c^+\to pK_S^0\pi^0)/\mathcal{B}(\Lambda_c^+\to pK^-\pi^+)$ using an integrated luminosity of 980.6 fb$^{-1}$ of $e^+e^-$ collision data from the Belle experiment. The value is obtained as $\mathcal{B}(\Lambda_c^+\to pK_S^0\pi^0)/\mathcal{B}(\Lambda_c^+\to pK^-\pi^+)=0.343\pm 0.002\pm 0.009$, where the first and second uncertainties are statistical and systematic, respectively. This measurement is the most precise thus far, with a fivefold improvement in precision over previous results, and is consistent with the world average. By combining this with the world average $\mathcal{B}(\Lambda_c^+\to pK^-\pi^+)$, we obtain the absolute branching fraction $\mathcal{B}(\Lambda_c^+\to pK_S^0\pi^0)=(2.16\pm 0.01\pm 0.05)\%$.
Tags
Working group Charm
Principal authors @  Jung Keun Ahn, Seongbae Yang
Young Jun Kim
Reference Phys.Rev.D 112, 012013 (2025), DOI: 10.1103/4mnw-tvks
Document BELLE2-PUB-DRAFT-2023-018
Links arXiv:2503.04371, Inspire,
Bibtex 
@article{Belle:2025voy,
    author = "Adachi, I. and others",
    collaboration = "Belle, Belle-II",
    title = "{Measurement of the branching fraction of {\ensuremath{\Lambda}}c+{\textrightarrow}pKS0{\ensuremath{\pi}}0 at Belle}",
    eprint = "2503.04371",
    archivePrefix = "arXiv",
    primaryClass = "hep-ex",
    reportNumber = "Belle II Preprint: 2024-022, KEK preprint: 2024-20",
    doi = "10.1103/4mnw-tvks",
    journal = "Phys. Rev. D",
    volume = "112",
    number = "1",
    pages = "012013",
    year = "2025"
}